JP3804345B2

JP3804345B2 - Circuit breaker

Info

Publication number: JP3804345B2
Application number: JP19960199A
Authority: JP
Inventors: 孝北村
Original assignee: Matsushita Electric Works Ltd
Current assignee: Panasonic Electric Works Co Ltd
Priority date: 1999-07-13
Filing date: 1999-07-13
Publication date: 2006-08-02
Anticipated expiration: 2019-07-13
Also published as: CN1319098C; CN1280375A; JP2001028225A

Description

【０００１】
【発明の属する技術分野】
本発明は、操作ハンドルの開閉操作により可動接点を固定接点に接離させるとともに、過大電流が流れたときに変位するバイメタルにより可動接点を固定接点から強制開極する回路遮断器に関するものである。
【０００２】
【従来の技術】
このような回路遮断器は種々市販されまた提案されているが、例えば、特開平９−９７５５４号公報には、弾性を有して操作ハンドルから延設された延設部およびその延設部と弾性方向に当接し得るよう器体に設けられた当接部を有する操作ハンドル規制手段を備え、組み立ての際の手間をかけずに、操作ハンドルを所定の位置に正確に位置規制することができるようにした回路遮断器が開示されている。
【０００３】
【発明が解決しようとする課題】
しかしながら、上記公報に記載の回路遮断器では、編組線の引回しに起因してバイメタルの引き外し特性が変化し、この結果、所望の引き外し特性が得られなくなる恐れがある。回路遮断器における操作ハンドル側を上側としたとき、編組線（可撓電線）は、一端側および他端側がそれぞれ回路遮断器内部で上下方向に伸びるバイメタルの下方自由端側および回路遮断器内部でどちらかといえば上下方向に伸び、回動可能となっている可動接触子の下方自由端側に接続され、回路遮断器のオン時に、可動接触子の自由端側がバイメタルの自由端側とは反対側に配置された固定接触子側に移動して、編組線の他端側が引っ張られる状態になるので、回路遮断器がオフ状態からオン状態に移行するとき、編組線がバイメタルの自由端の端面に引っ掛かると、バイメタルの自由端側も固定接触子側に引っ張られることになるからである。
【０００４】
本発明は、上記事情に鑑みてなされたものであり、バイメタルの引き外しの特性変化を防止し得る回路遮断器を提供することを目的とする。
【０００５】
【課題を解決するための手段】
上記課題を解決するために請求項１記載の発明の回路遮断器は、器体の両側に配設された電源側端子および負荷側端子と、電源側端子および負荷側端子の一方に固着された固定接点と、この固定接点に接離自在に対向する可動接点を先端側に固着して回動中心点となる基端側を器体の上側とするとともに先端側を器体の下側として器体の上下方向に延出させた可動接触子と、この可動接触子を器体の外部から操作可能な操作ハンドルにリンクを介して連結し、リンクの均衝状態を保持した状態で操作ハンドルの開閉操作により可動接触子を駆動して可動接点を固定接点に接離させる開閉機構と、電源側端子および負荷側端子の他方に接続された基端を器体の下側とするとともに先端側を器体の上側として器体の上下方向に延出させ、可動接点および固定接点間に過電流が流れると先端側の自由端が器体内部方向に変位することによりリンクの均衝状態を崩して開閉機構により可動接点を固定接点から強制開極するバイメタルと、このバイメタルの先端側に接続されるとともに該バイメタルの先端側から可動接触子の先端方向の斜め方向に引き延ばし可動接触子近傍で器体の上側に折り返して可動接触子の基端側に接続される編組線とを備え、前記電源側端子および負荷側端子の一方は、固定接点固着位置よりも先端側に可動接触子の周囲の磁界との相互作用でアークに作用する電磁力の向きに延長したアーク走行板部が形成され、前記器体の編組線を折り返す位置に編組線よりも器体の上側から突出して編組線が当接する第１位置決め突起を形成するとともに、この第１位置決め突起よりもバイメタル近傍に、第１位置決め突起の器体における下端とバイメタルにおける編組線接続位置とを結ぶ直線よりも上側で編組線の下側が当接する第２位置決め突起を形成し、さらに器体の上側方向に延出する編組線と可動接触子との間に介在する縦壁部を形成した回路遮断器において、前記器体の第２位置決め突起近傍に第２位置決め突起とともに編組線を挟む軸受を形成し、前記開閉機構に、中間部が前記軸受に回動自在に軸支されリンクに結合してリンクの均衡状態を保持するとともに過電流を検出したときに一端側がバイメタルより駆動されてリンクとの結合状態を解除するラッチ部材を有し、該ラッチ部材の中間部から他端側にかけて編組線が貫通する切欠部を形成したことを特徴とする。
【０００６】
この構成では、バイメタルの変位および可動接触子の回動動作に対して、編組線がバイメタルや可動接触子などに引っ掛からない状態でその折返し部分に余裕を持たせることができるので、バイメタルの引き外しの特性変化を防止することができる。また、固定接点に対する可動接触子の可動接点の開極時に発生するアークを、器体の下側方向に付勢して器体の長手方向に引き延ばすことができ、この結果、アークの素早い消弧が可能となる。
【０００７】
さらに、可動接触子の開閉動作のときに編組線の折り返し近傍が器体の上側に移動するのを防止することができるので、編組線が開閉機構に対してバイメタルの引き外し特性を変化させる影響を及ぼさなくなる。また、バイメタルの変位によって器体の上側に延びた編組線が可動接触子に近づくのを防止することができるので、編組線が可動接触子の動作に影響を及ばさなくなる。
【０００８】
加えて、バイメタルが変位したとき、第２位置決め突起近傍の編組線は横方向に移動するので、第１位置決め突起近傍の編組線が器体の下側に移動する量を少なくでき、器体の編組線を収納するスペースを小さくすることができる。
【００１０】
その上、編組線を位置決めした状態でラッチ部材を配置することができ、ラッチ部材の組込作業が容易となる。また、編組線がラッチ部材に当接してラッチ部材の回動に支障をきたす恐れがなくなる。
【００１１】
【発明の実施の形態】
図１は本発明に係る一実施形態の回路遮断器の断面図、図２は本実施形態の回路遮断器などの斜視図、図３は本実施形態の回路遮断器の分解斜視図で、これらの図を用いて以下に本実施形態の説明を行う。
【００１２】
本回路遮断器は、図２に示すように、器体を構成するケース１およびカバー２を備えるとともに、図３に示すように、スライダ３、電源側端子部４、異常電流検出・トリップ機能付きの負荷側端子部５、可動接触子部６、開閉機構７および編組線８（図１参照）を器体内部に備えている。ただし、以下の説明の便宜上、図３に示す器体において、上側の面を上面（正面）、下側の面を下面（裏面）、右上側の面を上側面、左下側の面を下側面、左上側の面を左側面、そして右下側の面を右側面とする。
【００１３】
ケース１およびカバー２は、例えばフェノール樹脂などの絶縁材料によって、図３に示すように、上面側中央が突出した一面開口の箱状に成形されて成り、ケース１およびカバー２の開口縁部には、それぞれ４組の組立孔１ａ，２ａが穿設されている。これにより、ケース１およびカバー２を内面同士が対面するようにして組み合わせた上で、各組の組立孔１ａ，２ａにリベットを挿通すれば、ケース１およびカバー２が固定されて器体が構成されることになる。また、ケース１およびカバー２の上面中央には、それぞれ後述する操作ハンドル７１用の開口部となるコ字状の上面角溝１ｂ，２ｂが形成され、ケース１およびカバー２の上側面には、それぞれ電源側の電線やブスバーなどの配線部材が挿入される開口部となるコ字状の上側面角溝（図３ではケース１の上側面角溝１ｃのみ図示）が形成され、そしてケース１およびカバー２の下側面には、それぞれ負荷側の電線やブスバーなどの配線部材が挿入される開口部となるコ字状の下側面角溝１ｄ，２ｄが形成されている。なお、これらケース１およびカバー２の詳細な構造については、後述の各部品とともに順次説明する。
【００１４】
スライダ３は、図３に示すように、器体下側面における下面側から突出する操作部３ａ、この操作部３ａから上側面側に延出する連結片３ｂ、この連結片３ｂの先端側に一体に設けられる爪部３ｃ、操作部３ａから連結片３ｂの両側に沿って延出する一対の撓み片３ｄ、および各撓み片３ｄの先端から外向きに延出するＶ字カット付きの突片３ｅを備える形状に合成樹脂により一体成形されて成り、図２に示すように、断面コ字状で両側縁部がそれぞれ外向きに延出した一体フランジ９ａを有し図略の分電盤内部などに配置されるＤＩＮレールという取付レール９に対して、本回路遮断器を着脱自在に固定するものである。ここで、図３に示すように、ケース１およびカバー２の下面には、それぞれ取付レール９用の取付溝１ｅ，２ｅが形成され、これら取付溝１ｅ，２ｅの上側面側には、それぞれ取付レール９の一方の一体フランジ９ａに対する掛止用の係止突起（図ではカバー２の係止突起２ｆのみ図示）が形成され、そして取付溝１ｅ，２ｅの下側面側には、それぞれスライダ３をスライド自在に狭持するフック状の収納溝１ｇ，２ｇが形成されている。これにより、スライダ３を収納溝１ｇ，２ｇに収納しながらケース１およびカバー２を固定すれば、スライド３は収納溝１ｇ，２ｇにより狭持された状態で上側面および下側面方向にスライド自在となるので、取付レール９の一方の一体フランジ９ａに両係止突起を掛止し、スライド３を上側面側にスライドさせて他方の一体フランジ９ａに爪部３ｃを掛止すれば、本回路遮断器が取付レール９に固定されることになる。ただし、図示していないが、収納溝１ｇ，２ｇの各内面には山突起が形成され、上記のように本回路遮断器が取付レール９に固定されている場合、上記各山突起に各突片３ｅのＶカットの溝が係合し、スライダ３の移動を禁止する構造になっている。
【００１５】
電源側端子部４は、図３に示すように、板金を折曲げて断面四角状の筒状に形成されて成り上面にねじ孔１１ａを有する端子金具１１と、この端子金具１１のねじ孔１１ａに螺挿される引締めねじ１２と、端子金具１１の下面上部に取着される金属部材１３とを備えているとともに、電源側端子４１を備えている。この電源側端子４１は、上面および下面方向に伸びる板状に形成され固定接点４１１ａが固着された中央部４１１と、この中央部４１１の上面側から上側面側に延出し端子金具１１内に挿通される端子部４１２と、固定接点４１１ａの下面側から後述する可動接触子６１の周囲の磁界との相互作用でアークに作用する電磁力の向きに、つまり中央部４１１の下面側から下面下側面寄りに延出するアーク走行板部４１３とを備える形状に導電部材により一体形成されて構成される。このようにアーク走行板部４１３を設けると、固定接点４１１ａに対する可動接触子６１の可動接点の開極時に発生するアークを、器体の下面方向に付勢して器体の長手方向に引き延ばすことができ、この結果、アークの素早い消弧が可能となる。また、端子部４１２の先端には上面側に延出する屈曲部４１２ａが形成されている。
【００１６】
負荷側端子部５は、端子金具１１、引締めねじ１２および金属部材１３を電源側端子部４と同様に備えているほか、上面および下面方向に伸びる板状に形成された連結部５１１、この連結部５１１の上面側から下側面側に延出し端子金具１１内に挿通される端子部５１２と、上面および下面方向に伸びる板状に形成され下端が基端となって連結部５１１に固着されるバイメタル５１３とを有して成る負荷側端子５１と、上側面側に延出する両屈曲部５２ａを有して成りこれら両屈曲部５２ａ内に負荷側端子５１のバイメタル５１３を囲う短絡検出用の磁性板５２とを備えている。また、端子部５１２の先端には上面側に延出する屈曲部５１２ａが形成されている。また、バイメタル５１３の上面側には調節ねじ５１４が螺挿されている。さらに、磁性板５２は、ケース１およびカバー２の内面に形成されたコ字状の突部と係合する突起を有している。
【００１７】
ここで、図１に示すように、ケース１の内面における上側面および下側面側には、端子金具１１およびこれに螺挿された引締めねじ１２用の収納室を設けるための隔壁１ｈ，１ｉがそれぞれ形成され、これら隔壁１ｈ，１ｉには、それぞれ電源側端子４１および負荷側端子５１を填め込むための溝１ｊ，１ｋが形成されている。また、図３に示すように、ケース１およびカバー２の両上面における電源側端子部４の引締めねじ１２の頭部側には、それぞれドライバなどの先端挿通用の丸孔となる半円弧状の丸溝１ｌ，２ｌが形成され、同様に、ケース１およびカバー２の両上面における負荷側端子部５の引締めねじ１２の頭部側には、それぞれ半円弧状の丸溝１ｍ，２ｍが形成されている。これにより、図１に示すように、電源側端子部４の端子金具１１の孔がケース１およびカバー２の上側面角溝により形成される開口部に位置する状態で、その開口部に電源側の電線やブスバーなどの配線部材を挿入し、引締めねじ１２をドライバなどで例えば時計回りに回せば、端子金具１１が上面側に移動するので、配線部材を端子部４１２の下面に圧着させることができる。同様に、負荷側端子部５の端子金具１１の孔がケース１およびカバー２の下側面角溝１ｃ，２ｃにより形成される開口部に位置する状態で、その開口部に負荷側の電線やブスバーなどの配線部材を挿入し、端子金具１１が上面側に移動するように引締めねじ１２を回せば、端子金具１１が上面側に移動するので、配線部材を端子部５１２の下面に圧着させることができる。
【００１８】
可動接触子部６は、図３に示すように、上面および下面方向に伸びる板状部６１１、この板状部６１１の下面側に固着され固定接点４１１ａと接離自在に対向する可動接点６１１ａ、板状部６１１の両側上面側から下側面側に延出する一対の屈曲部６１２、および板状部６１１の上面側に一体に形成されたＬ字状のばね受け部６１３を有して成る可動接触子６１と、この可動接触子６１をこの上端を略回動中心点としてばね受け部６１３で下側面側に付勢して固定接点４１１ａから可動接点６１１ａを開離させるための開極ばね６２とを備えている。また、各屈曲部６１２には軸孔６１２ａが穿設されている。さらに、ばね受け部６１３の両側には一対の耳部６１３ａが形成されている。
【００１９】
開閉機構７は、操作ハンドル７１、ハンドル軸７２、ハンドルリンク７３、係止リンク７４、接触子リンク７５、ハンドル復帰ばね７６、ラッチ板７７および軸ピン７８により構成されている。操作ハンドル７１は、回動中心点となる軸孔７１１ａが穿設された軸部７１１と、この軸部７１１の上面側に形成された弧状の覆い片７１２と、この覆い片７１２の中央部から立設し上面角溝１ａ，２ａにより形成される開口部から外部に突出する操作部７１３と、左右側面側に突出する軸突起７１４ａを有し軸部７１１から下面側の上側面寄りに延出するリンク支持部７１４とを備える形状に合成樹脂により一体成形されて構成される。ハンドル軸７２は、操作ハンドル７１を軸支するもので、操作ハンドル７１の軸孔７１１ａに挿通される。ハンドルリンク７３は、コ字状に形成されて成り、各脚片の先端部に穿設されリンク支持部７１４の軸突起７１４ａが挿通される軸受孔７３ａと、各脚片の基部側に穿設されたリンク孔７３ｂとを有している。係止リンク７４は、平板状の係止部７４１、およびこの係止部７４１の両端から上側面側の上面寄りに延出する一対のガイド片７４２を備える形状に形成され、各ガイド片７４２の先端に穿設されハンドル軸７２が挿通される軸孔７４２ａと各ガイド片７４２の基端側に穿設されたガイド孔７４２ｂとを有している。接触子リンク７５は、金属製のピンをコ字状に折曲げて成り、可動接触子６１の両軸孔６１２ａに挿通される脚片７５ａを有するとともに、ハンドルリンク７３の両リンク孔７３ｂおよび係止リンク７４の両ガイド孔７４２ｂに挿通され脚片７５ａよりも短い脚片７５ｂを有している。ハンドル復帰ばね７６は、鋏形ばねより成り、一端が覆い片７１２の左側面側に係止するとともに他端がラッチ板７７に係止することで、操作ハンドル７１をオフ側に付勢するものである。ラッチ板７７は、上側面および下側面に対面するとともに上面および下面方向に伸び切欠部７７１ａを左側面側に有するコ字状に形成されそのコ字状の上面側の突部における切欠部７７１ａ側にハンドル復帰ばね７６の他端が係止する係止溝７７１ｂを有する板状部７７１と、この板状部７７１の中央の左右側面側からそれぞれ上側面側に延出する左腕片７７２およびこれよりも短い右腕片７７３とを備える形状に一体形成されて成り、左腕片７７２および右腕片７７３の各基端側に穿設された軸孔を有するとともに、左腕片７７２の先端に形成され係止リンク７４の係止部７４１の下面側と係止する引掛溝７７２ａを有している。軸ピン７８は、ラッチ板７７を軸支するもので、左腕片７７２および右腕片７７３の両軸孔に挿通される。
【００２０】
ここで、ケース１およびカバー２の各内面における上面と上側面の隅には、可動接触子６１の耳部６１３ａを回動の中心として収納する基端収納壁（図３ではケース１の基端収納壁１ｎのみ図示）が形成されているとともに、その下面側には、コ字状に成形されて成り、可動接触子６１の両軸孔６１２ａに挿通された接触子リンク７５の脚片７５ａの先端部がそのコ字状の内壁に挿入されるガイド突部１ｏが形成されている。これにより、可動接触子６１は、ばね受け部６１３の上側面側に開極ばね６２を挟み込みながら、各耳部６１３ａを基端収納壁内に収納するとともに脚片７５ａの先端部をガイド突部１ｏの壁内に挿入すれば、両軸孔６１２ａがガイド突部１ｏに規制されながら両耳部６１３ａを中心として回動可能となる。また、ケース１およびカバー２の各内面における上面側中央には、ハンドル軸７２の端部が挿入される円筒状で底部を有する軸受（図３ではケース１の軸受１ｐのみ図示）が形成されている。これにより、操作ハンドル７１の軸孔７１１ａにハンドル軸７２を挿通し、このハンドル軸７２の両端を上記両軸受内に挿入した状態でケース１およびカバー２を固定すれば、操作ハンドル７１はハンドル軸７２回りに回動自在となる。さらに、ケース１およびカバー２の各内面における上記ガイド突部１ｏの下側面側には、軸ピン７８の端部が挿入される円筒状で底部を有する軸受（図３ではケース１の軸受１ｑのみ図示）が形成されている。これにより、ラッチ板７７の両軸孔に軸ピン７８を挿通し、この軸ピン７８の両端を両軸受内に挿入した状態でケース１およびカバー２を固定すれば、ラッチ板７７は軸ピン７８回りに回動自在となる。
【００２１】
編組線８は、図１に示すように、負荷側端子５１のバイメタル５１３の上面側に一端（図では左端）が接続され、そのバイメタル５１３の上面側から可動接触子６１の先端方向の斜め方向に、すなわち下面側の上側面寄りの斜め方向に引き延ばして可動接触子６１の近傍で器体の上面側に折り返すように引き回され、可動接触子６１の基端側に他端が接続されている。これにより、負荷側端子部５と可動接触子６１とが編組線８により常時電気的に接続される状態となる。また、バイメタル５１３の変位および可動接触子６１の回動動作に対して、編組線８がバイメタル５１３や可動接触子６１などに引っ掛からない状態でその折返し部分に余裕を持たせることができるので、バイメタル５１３の引き外しの特性変化を防止することができる。
【００２２】
ここで、ケース１の内面において、編組線８を折り返す位置には、編組線８よりも器体の上面側から突出し半円弧状に丸められた側面で編組線８と当接する突起１ｒ（第１位置決め突起）が形成されているとともに、器体の上面側に延出する編組線８と可動接触子６１との間には、上面および下面方向に伸びる縦壁部１ｓが形成され、この縦壁部１ｓは下側面に至る隔壁部１ｔと連設されている。これにより、可動接触子６１の開閉動作のときに編組線８の折り返し近傍が器体の上面側に移動するのを防止することができるので、編組線８が開閉機構７に対してバイメタル５１３の引き外し特性を変化させる影響を及ぼさなくなる。また、編組線８と当接する突起１ｒの側面が丸められているので、編組線８を切れ難くすることができる。さらに、バイメタル５１３の変位によって器体の上面側に延びた編組線８が可動接触子６１に近づくのを防止することができるので、編組線８が可動接触子６１の動作に影響を及ばさなくなる。
【００２３】
また、ケース１の内面において、突起１ｒから下側面側の若干上面寄りで軸受１ｑの下面側のバイメタル５１３近傍には、半円弧状に丸められた側面で編組線８の下面側と当接する突起１ｕ（第２位置決め突起）が形成されている。これにより、バイメタル５１３が変位したとき、突起１ｕ近傍の編組線８は上側面および下側面方向に移動するので、突起１ｒ近傍の編組線８が器体の下面側に移動する量を少なくでき、器体の編組線８を収納するスペースを小さくすることができる。また、編組線８と当接する突起１ｕの側面が丸められているので、編組線８を切れ難くすることができる。さらに、編組線８が軸受１ｑと突起１ｕとの間に狭持され、その狭持領域にラッチ板７７の切欠部７７１ａが位置するようになるので、編組線８を位置決めした状態でラッチ板７７を配置することができ、ラッチ板７７の組込作業が容易となる。また、編組線８がラッチ板７７に当接してラッチ板７７の回動に支障をきたす恐れがなくなる。
【００２４】
図４は本実施形態の動作説明図で、この図を用いて次に本実施形態の動作を説明する。本回路遮断器が図４（ａ）に示すようにオフ状態にある場合、操作ハンドル７１の操作部７１３が下側面側（図では左側）に位置して、リンク支持部７１４の両軸突起７１４ａがハンドル軸７２に対して上側面側（図では右側）に位置し、リンク支持部７１４およびハンドルリンク７３が屈曲して縮み、係止リンク７４が接触子リンク７５を介してハンドルリンク７３によりハンドル軸７２に対して反時計回りに引っ張られた状態にある。また、ハンドル復帰ばね７６によって、操作ハンドル７１が反時計回りに付勢されているとともに、ラッチ板７７の係止溝７７１ｂが上面側の下側面寄りに付勢されてラッチ板７７の左腕片７７２が反時計回りに付勢された状態にあり、ラッチ板７７の引掛溝７７２ａと係止リンク７４の係止部７４１の下面側とが係止した状態にある。一方、可動接触子６１は、開極ばね６２により下側面側に付勢され、両耳部６１３ａが器体の下側面側における基端収納壁に当接するとともに板状部６１１が縦壁部１ｓの上側面側に当接し、可動接点６１１ａが電源側端子４１の固定接点４１１ａから開離した状態にある。このため、電源側端子部４と負荷側端子部５とは非導通の状態にあり、電源側端子部４と負荷側端子部５との間に電流が流れることがないので、バイメタル５１３が機能して上側面側に湾曲することはなく、上記オフ状態が安定的に保持されることになる。
【００２５】
このような状態から、図４（ｂ）に示すように、操作ハンドル７１の操作部７１３をハンドル軸７２に対して時計回りに回動させてオン側に切り替えると、ハンドルリンク７３の両リンク孔７３ｂに挿通された接触子リンク７５の脚片７５ｂの移動方向が、係止部７４１と引掛溝７７２ａとの係止で下側面側への動きが禁止された係止リンク７４における両ガイド孔７４２ｂによって規制を受けながら、リンク支持部７１４の軸突起７１４ａがハンドル軸７２に対して下面側に位置し、リンク支持部７１４およびハンドルリンク７３が伸びた状態になる。この状態になるとき、規制を受けた接触子リンク７５の脚片７５ｂが両ガイド孔７４２ｂに沿って上面側から下面側に移動するので、ガイド突部１ｏのコ字状の内壁に沿って移動する接触子リンク７５の脚片７５ａによって可動接触子６１が上側面側に押されて、可動接触子６１の可動接点６１１ａが電源側端子４１の固定接点４１１ａに閉接することになる。この結果、電源側端子部４と負荷側端子部５とが導通状態になる。
【００２６】
このような導通状態において、電源側端子部４と負荷側端子部５との間に過電流が流れ、バイメタル５１３が自己発熱して上側面側に湾曲する場合、あるいは電源側端子部４と負荷側端子部５との間に短絡電流が流れ、バイメタル５１３を流れる短絡電流と磁性板５２の磁束との電磁作用によりバイメタル５１３が上側面側に湾曲する場合には、ラッチ板７７の上面側がバイメタル５１３の上面側に螺挿された調節ねじ５１４により時計回りに押圧されるので、ラッチ板７７の左腕片７７２が軸ピン７８に対して時計回りに回動する。この結果、係止部７４１と引掛溝７７２ａとの係止状態が解除されるとともにその係止点に集中していた開極ばね６２の付勢力が一気に放出され、図４（ｃ）に示すように、可動接触子６１の可動接点６１１ａが電源側端子４１の固定接点４１１ａから瞬時に開離して、電源側端子部４から負荷側端子部５への電力供給が緊急停止（トリップ）される。この後、操作ハンドル７１は、ハンドル復帰ばね７６によって反時計回りに付勢されているので、操作部７１３が下側面側に位置する図４（ａ）のオフ状態に復帰することになる。
【００２７】
以上により、編組線８は、図４から分かるように、両端側への引張りが最もきつくなるオン状態および若干緩くなるオフ状態の場合には、開閉機構７に引っ掛からないようにした引き回し状態をほぼ保持するとともに、両端側への引張りが最も緩くなるトリップ状態の場合には、開閉機構７とは全く関係のない突起１ｒの下面側で緩むので、編組線８の緩みなどの変化部分が開閉機構７に干渉するのを防止することができ、この結果、バイメタル５１３の引き外しの特性変化を好適に防止することが可能になる。
【００２８】
なお、本実施形態では、４を電源側端子部として５を負荷側端子部としたが、これに限らず、４を負荷側端子部として５を電源側端子部としてもよい。
【００２９】
また、本実施形態では、突起１ｒ，１ｕは、半円弧状に成形される構造になっているが、これに限らず、円柱状に成形される構造でもよい。要するに、本発明の第１および第２位置決め突起は少なくとも編組線が当接する側面が丸められる構造であればよい。
【００３０】
【発明の効果】
以上のことから明らかなように、請求項１記載の発明によれば、器体の両側に配設された電源側端子および負荷側端子と、電源側端子および負荷側端子の一方に固着された固定接点と、この固定接点に接離自在に対向する可動接点を先端側に固着して回動中心点となる基端側を器体の上側とするとともに先端側を器体の下側として器体の上下方向に延出させた可動接触子と、この可動接触子を器体の外部から操作可能な操作ハンドルにリンクを介して連結し、リンクの均衝状態を保持した状態で操作ハンドルの開閉操作により可動接触子を駆動して可動接点を固定接点に接離させる開閉機構と、電源側端子および負荷側端子の他方に接続された基端を器体の下側とするとともに先端側を器体の上側として器体の上下方向に延出させ、可動接点および固定接点間に過電流が流れると先端側の自由端が器体内部方向に変位することによりリンクの均衝状態を崩して開閉機構により可動接点を固定接点から強制開極するバイメタルと、このバイメタルの先端側に接続されるとともに該バイメタルの先端側から可動接触子の先端方向の斜め方向に引き延ばし可動接触子近傍で器体の上側に折り返して可動接触子の基端側に接続される編組線とを備え、前記電源側端子および負荷側端子の一方は、固定接点固着位置よりも先端側に可動接触子の周囲の磁界との相互作用でアークに作用する電磁力の向きに延長したアーク走行板部が形成され、前記器体の編組線を折り返す位置に編組線よりも器体の上側から突出して編組線が当接する第１位置決め突起を形成するとともに、この第１位置決め突起よりもバイメタル近傍に、第１位置決め突起の器体における下端とバイメタルにおける編組線接続位置とを結ぶ直線よりも上側で編組線の下側が当接する第２位置決め突起を形成し、さらに器体の上側方向に延出する編組線と可動接触子との間に介在する縦壁部を形成した回路遮断器において、前記器体の第２位置決め突起近傍に第２位置決め突起とともに編組線を挟む軸受を形成し、前記開閉機構に、中間部が前記軸受に回動自在に軸支されリンクに結合してリンクの均衡状態を保持するとともに過電流を検出したときに一端側がバイメタルより駆動されてリンクとの結合状態を解除するラッチ部材を有し、該ラッチ部材の中間部から他端側にかけて編組線が貫通する切欠部を形成したことを特徴とするので、バイメタルの引き外しの特性変化を防止することができるとともにアークの素早い消弧が可能となる。
【００３１】
また、編組線が開閉機構に対してバイメタルの引き外し特性を変化させる影響を及ぼさなくなるとともに、編組線が可動接触子の動作に影響を及ばさなくなる。
【００３２】
加えて、器体の編組線を収納するスペースを小さくすることができる。
【００３４】
その上、ラッチ部材の組込作業が容易となる。また、編組線がラッチ部材に当接してラッチ部材の回動に支障をきたす恐れがなくなる。
【図面の簡単な説明】
【図１】本発明に係る一実施形態の回路遮断器の断面図である。
【図２】本実施形態の回路遮断器などの斜視図である。
【図３】本実施形態の回路遮断器の分解斜視図である。
【図４】本実施形態の動作説明図である。
【符号の説明】
１ケース
１ｑ軸受
１ｒ，１ｕ突起
１ｓ縦壁部
２カバー
３スライダ
４電源側端子部
４１電源側端子
４１１ａ固定接点
５負荷側端子部
５１負荷側端子
５１３バイメタル
５２磁性板
６可動接触子部
６１可動接触子
６１１ａ可動接点
６２開極ばね
７開閉機構
７１操作ハンドル
７２ハンドル軸
７３ハンドルリンク
７４係止リンク
７５接触子リンク
７６ハンドル復帰ばね
７７ラッチ板
７７１ａ切欠部
７８軸ピン
８偏組線
１１端子金具
１２引締めねじ
１３金属部材[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a circuit breaker in which a movable contact is brought into and out of contact with a fixed contact by opening and closing an operation handle, and the movable contact is forcibly opened from a fixed contact by a bimetal that is displaced when an excessive current flows.
[0002]
[Prior art]
Various circuit breakers such as these are commercially available and proposed. For example, Japanese Patent Application Laid-Open No. 9-97554 discloses an extended portion extending from an operation handle with elasticity, and an extended portion thereof. An operation handle restricting means having an abutting portion provided on the container so as to be able to abut in the elastic direction is provided, and the operation handle can be accurately regulated at a predetermined position without taking the trouble of assembling. A circuit breaker configured as described above is disclosed.
[0003]
[Problems to be solved by the invention]
However, in the circuit breaker described in the above publication, the tripping characteristic of the bimetal changes due to the routing of the braided wire, and as a result, the desired tripping characteristic may not be obtained. When the operation handle side of the circuit breaker is on the upper side, the braided wire (flexible wire) is on the lower free end side of the bimetal and the inside of the circuit breaker. If anything, it is connected to the lower free end of the movable contact that extends in the vertical direction and is rotatable, and when the circuit breaker is turned on, the free end of the movable contact is opposite to the free end of the bimetal. The other end side of the braided wire is pulled by moving to the fixed contact side arranged on the side, so when the circuit breaker transitions from the off state to the on state, the braided wire is the end face of the free end of the bimetal This is because the free end side of the bimetal is also pulled to the fixed contact side.
[0004]
This invention is made | formed in view of the said situation, and it aims at providing the circuit breaker which can prevent the characteristic change of tripping of a bimetal.
[0005]
[Means for Solving the Problems]
  In order to solve the above-mentioned problems, the circuit breaker according to the first aspect of the present invention is fixed to one of the power supply side terminal and the load side terminal and the power supply side terminal and the load side terminal disposed on both sides of the container. A fixed contact and a movable contact that is detachably opposed to the fixed contact are fixed to the distal end side, and the base end side serving as the center of rotation is set to the upper side of the body, and the distal end side is set to the lower side of the body. A movable contact extending in the vertical direction of the body and this movable contact are connected to an operation handle that can be operated from the outside of the body via a link. An open / close mechanism that drives the movable contact by opening / closing operation to move the movable contact to and away from the fixed contact, and the base end connected to the other of the power supply side terminal and the load side terminal is the lower side of the body and the distal end side is A movable contact that extends in the vertical direction of the body as the upper side of the body A bimetal for opening force a movable contact from the fixed contact by the opening and closing mechanism destroy the Hitoshi衝 state of the link by an over current flows between the preliminary fixed contact front end side of the free end is displaced to the device body inside direction,The bimetal is connected to the distal end side of the bimetal and extended in an oblique direction from the distal end side of the bimetal to the distal end direction of the movable contact, and is folded back to the upper side of the body near the movable contact and connected to the proximal end of the movable contact.With braided wire,in frontOne of the power supply side terminal and the load side terminal is formed with an arc running plate extending in the direction of electromagnetic force acting on the arc by interaction with the magnetic field around the movable contact on the tip side from the fixed contact fixing position IsAnd forming a first positioning projection that protrudes from the upper side of the container body at the position where the braided wire of the container is folded back and abuts the braided wire, and is positioned closer to the bimetal than the first positioning projection. A second positioning projection is formed on the upper side of the straight line connecting the lower end of the projection in the container and the braided wire connection position in the bimetal, and the lower side of the braided line is in contact with the braided wire extending in the upper direction of the container. In the circuit breaker having a vertical wall portion interposed between the contact and the contactor, a bearing for sandwiching the braided wire together with the second positioning projection is formed in the vicinity of the second positioning projection of the container, Is pivotally supported by the bearing and is connected to the link to maintain the link equilibrium state. When an overcurrent is detected, one end is driven by the bimetal to release the link connection state. Have that latch member, the braided wire toward the other end from the intermediate portion of the latch member is characterized in that the formation of the notch penetrates.
[0006]
In this configuration, it is possible to allow the folded portion to have a margin with respect to the displacement of the bimetal and the rotational movement of the movable contact so that the braided wire does not catch on the bimetal or the movable contact. It is possible to prevent the change in characteristics. In addition, the arc generated when the movable contact of the movable contact with respect to the fixed contact is opened can be urged downward in the body and extended in the longitudinal direction of the body. Is possible.
[0007]
  further,Since it is possible to prevent the vicinity of the folded back of the braided wire from moving to the upper side of the container during the opening / closing operation of the movable contact, the braided wire has an effect of changing the bimetal tripping characteristic on the opening / closing mechanism. Disappear. In addition, the braided wire extending upward from the body due to the displacement of the bimetal can be prevented from approaching the movable contact, so that the braided wire does not affect the operation of the movable contact.
[0008]
  in addition,When the bimetal is displaced, the braided wire in the vicinity of the second positioning protrusion moves in the horizontal direction, so the amount of movement of the braided wire in the vicinity of the first positioning protrusion to the lower side of the instrument can be reduced, and the braided wire of the instrument is reduced. The storage space can be reduced.
[0010]
  Moreover,The latch member can be arranged with the braided wire positioned, and the assembly work of the latch member is facilitated. Further, there is no possibility that the braided wire comes into contact with the latch member and hinders the rotation of the latch member.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 is a cross-sectional view of a circuit breaker according to an embodiment of the present invention, FIG. 2 is a perspective view of the circuit breaker of the present embodiment, and FIG. 3 is an exploded perspective view of the circuit breaker of the present embodiment. The present embodiment will be described below with reference to FIG.
[0012]
As shown in FIG. 2, the circuit breaker includes a case 1 and a cover 2 that constitute the body, and as shown in FIG. 3, a slider 3, a power supply side terminal portion 4, an abnormal current detection / trip function are provided. Load side terminal portion 5, movable contact portion 6, opening / closing mechanism 7 and braided wire 8 (see FIG. 1) are provided inside the container. However, for convenience of the following description, in the container shown in FIG. 3, the upper surface is the upper surface (front surface), the lower surface is the lower surface (back surface), the upper right surface is the upper surface, and the lower left surface is the lower surface. The upper left surface is the left side and the lower right side is the right side.
[0013]
As shown in FIG. 3, the case 1 and the cover 2 are formed into a box shape with a single-side opening with the center on the upper surface protruding, as shown in FIG. 3, and an opening edge of the case 1 and the cover 2 is formed. Each has four sets of assembly holes 1a and 2a. Thus, after the case 1 and the cover 2 are combined so that the inner surfaces face each other, and the rivets are inserted into the assembly holes 1a and 2a of each set, the case 1 and the cover 2 are fixed and the body is configured. Will be. In addition, U-shaped upper surface corner grooves 1b and 2b that are openings for an operation handle 71 described later are formed in the center of the upper surface of the case 1 and the cover 2, respectively. A U-shaped upper side corner groove (only the upper side corner groove 1c is shown in FIG. 3) is formed as an opening into which a wiring member such as an electric wire or bus bar on the power source side is inserted. On the lower side surface of the cover 2, U-shaped lower side corner grooves 1d and 2d, which are openings into which wiring members such as electric wires and bus bars on the load side are respectively inserted, are formed. Note that the detailed structures of the case 1 and the cover 2 will be sequentially described together with the components described later.
[0014]
As shown in FIG. 3, the slider 3 includes an operation portion 3a protruding from the lower surface side of the lower body side, a connection piece 3b extending from the operation portion 3a to the upper side surface, and a tip of the connection piece 3b. A pair of flexure pieces 3d extending from the operation portion 3a along both sides of the connecting piece 3b, and a protruding piece 3e with a V-shaped cut extending outward from the tip of each flexure piece 3d. 2 and is integrally molded with a synthetic resin. As shown in FIG. 2, it has an integral flange 9a with a U-shaped cross section and outwardly extending on both sides, and the inside of a distribution board (not shown). The circuit breaker is detachably fixed to a mounting rail 9 called a DIN rail arranged in the detachable manner. Here, as shown in FIG. 3, mounting grooves 1e and 2e for the mounting rail 9 are formed on the lower surfaces of the case 1 and the cover 2, respectively, and the mounting grooves 1e and 2e are respectively mounted on the upper side surfaces. A latching projection for latching with respect to one integral flange 9a of the rail 9 (only the latching projection 2f of the cover 2 is shown in the figure) is formed, and sliders 3 are respectively provided on the lower side surfaces of the mounting grooves 1e and 2e. Hook-like storage grooves 1g and 2g that are slidably held are formed. Thus, if the case 1 and the cover 2 are fixed while the slider 3 is stored in the storage grooves 1g and 2g, the slide 3 can be slid in the upper side surface and the lower side direction while being held by the storage grooves 1g and 2g. Therefore, if both locking projections are hooked on one integral flange 9a of the mounting rail 9, the slide 3 is slid to the upper side surface, and the claw portion 3c is latched on the other integral flange 9a, the circuit is interrupted. The device is fixed to the mounting rail 9. However, although not shown in the drawings, a protrusion is formed on each inner surface of the storage grooves 1g, 2g, and when the circuit breaker is fixed to the mounting rail 9 as described above, The V-cut groove of the piece 3e is engaged, and the slider 3 is prohibited from moving.
[0015]
As shown in FIG. 3, the power source side terminal portion 4 is formed by bending a sheet metal into a cylindrical shape having a square cross section and having a screw hole 11 a on the upper surface and a screw hole 11 a of the terminal metal 11. And a metal member 13 attached to the upper portion of the lower surface of the terminal fitting 11 and a power supply side terminal 41. The power supply side terminal 41 is formed in a plate shape extending in the upper surface and lower surface directions and has a central portion 411 to which a fixed contact 411a is fixed, and extends from the upper surface side of the central portion 411 to the upper side surface and is inserted into the terminal fitting 11. Direction of the electromagnetic force acting on the arc by the interaction between the terminal portion 412 to be operated and the magnetic field around the movable contact 61 described later from the lower surface side of the fixed contact 411a, that is, from the lower surface side of the central portion 411 to the lower surface on the lower surface It is integrally formed of a conductive member in a shape including an arc traveling plate portion 413 extending toward the side. When the arc traveling plate portion 413 is provided in this way, the arc generated when the movable contact of the movable contact 61 with respect to the fixed contact 411a is opened is urged toward the lower surface of the container and extended in the longitudinal direction of the container. As a result, the arc can be extinguished quickly. Further, a bent portion 412 a extending to the upper surface side is formed at the tip of the terminal portion 412.
[0016]
The load side terminal portion 5 includes a terminal fitting 11, a tightening screw 12 and a metal member 13 in the same manner as the power source side terminal portion 4, and a connecting portion 511 formed in a plate shape extending in the upper surface and lower surface directions. A terminal portion 512 that extends from the upper surface side to the lower surface side of the portion 511 and is inserted into the terminal fitting 11, and is formed in a plate shape that extends in the upper surface and lower surface directions, and is fixed to the connecting portion 511 with the lower end serving as a base end. The load side terminal 51 having the bimetal 513 and the both bent portions 52a extending to the upper side face are formed, and the bimetal 513 of the load side terminal 51 is enclosed in the both bent portions 52a for short circuit detection. And a magnetic plate 52. Further, a bent portion 512 a extending to the upper surface side is formed at the tip of the terminal portion 512. An adjustment screw 514 is screwed on the upper surface side of the bimetal 513. Further, the magnetic plate 52 has a protrusion that engages with a U-shaped protrusion formed on the inner surface of the case 1 and the cover 2.
[0017]
Here, as shown in FIG. 1, partition walls 1h and 1i are provided on the upper side surface and lower side surface side of the inner surface of the case 1 to provide a storage chamber for the terminal fitting 11 and the tightening screw 12 screwed into the terminal fitting 11, respectively. The partition walls 1h and 1i are respectively formed with grooves 1j and 1k for fitting the power supply side terminal 41 and the load side terminal 51, respectively. Further, as shown in FIG. 3, the head side of the tightening screw 12 of the power supply side terminal portion 4 on both upper surfaces of the case 1 and the cover 2 has a semicircular arc shape that becomes a round hole for inserting a tip of a driver or the like. Round grooves 1l and 2l are formed, and similarly, semicircular circular grooves 1m and 2m are formed on the top side of the tightening screw 12 of the load side terminal portion 5 on both upper surfaces of the case 1 and the cover 2, respectively. ing. As a result, as shown in FIG. 1, in the state where the hole of the terminal fitting 11 of the power supply side terminal portion 4 is located in the opening formed by the upper side corner groove of the case 1 and the cover 2, If a wiring member such as a wire or a bus bar is inserted and the tightening screw 12 is turned clockwise with a screwdriver or the like, for example, the terminal fitting 11 moves to the upper surface side, so that the wiring member can be crimped to the lower surface of the terminal portion 412. it can. Similarly, in the state where the hole of the terminal fitting 11 of the load side terminal portion 5 is located in the opening formed by the lower side corner grooves 1c, 2c of the case 1 and the cover 2, the load side electric wire or bus bar is placed in the opening. When the tightening screw 12 is turned so that the terminal fitting 11 moves to the upper surface side, the terminal fitting 11 moves to the upper surface side, so that the wiring member can be crimped to the lower surface of the terminal portion 512. it can.
[0018]
As shown in FIG. 3, the movable contact portion 6 includes a plate-like portion 611 extending in the upper surface and lower surface directions, a movable contact 611 a fixed to the lower surface side of the plate-like portion 611 and facing the fixed contact 411 a detachably. A movable member having a pair of bent portions 612 extending from the upper surface side to the lower surface surface of both sides of the plate-like portion 611 and an L-shaped spring receiving portion 613 integrally formed on the upper surface side of the plate-like portion 611. A contact 61 and an opening spring 62 for urging the movable contact 61 toward the lower surface side by a spring receiving portion 613 with the upper end as a substantially rotational center point to separate the movable contact 611a from the fixed contact 411a. And. Each bent portion 612 is provided with a shaft hole 612a. Further, a pair of ear portions 613 a are formed on both sides of the spring receiving portion 613.
[0019]
The opening / closing mechanism 7 includes an operation handle 71, a handle shaft 72, a handle link 73, a locking link 74, a contact link 75, a handle return spring 76, a latch plate 77, and a shaft pin 78. The operation handle 71 includes a shaft portion 711 in which a shaft hole 711 a serving as a rotation center point is formed, an arc-shaped covering piece 712 formed on the upper surface side of the shaft portion 711, and a center portion of the covering piece 712. An operating portion 713 that protrudes outward from an opening formed by the upper surface angular grooves 1a and 2a and an axial projection 714a that protrudes to the left and right side surfaces and extends from the shaft portion 711 toward the upper surface of the lower surface side. And a link support portion 714 to be integrally formed of synthetic resin. The handle shaft 72 supports the operation handle 71 and is inserted into the shaft hole 711 a of the operation handle 71. The handle link 73 is formed in a U-shape, and is drilled in the tip end portion of each leg piece, and in the bearing hole 73a through which the shaft projection 714a of the link support portion 714 is inserted, and in the base side of each leg piece. Link hole 73b. The locking link 74 is formed in a shape including a flat locking portion 741 and a pair of guide pieces 742 extending from both ends of the locking portion 741 toward the upper surface on the upper side surface. It has a shaft hole 742 a that is drilled at the distal end and through which the handle shaft 72 is inserted, and a guide hole 742 b that is drilled on the proximal end side of each guide piece 742. The contact link 75 is formed by bending a metal pin into a U-shape, and has leg pieces 75a inserted into both shaft holes 612a of the movable contact 61, and both the link holes 73b of the handle link 73 and the engagement links 73. A leg piece 75b that is inserted into both guide holes 742b of the stop link 74 and shorter than the leg piece 75a is provided. The handle return spring 76 is formed of a hook-shaped spring, and has one end locked to the left side of the cover piece 712 and the other end locked to the latch plate 77 to urge the operation handle 71 to the off side. It is. The latch plate 77 faces the upper side surface and the lower side surface and extends in the upper surface and lower surface directions, and is formed in a U shape having a notch portion 771a on the left side surface side. The notch portion 771a side of the projecting portion on the upper surface side of the U shape A plate-like portion 771 having a locking groove 771b for engaging the other end of the handle return spring 76, a left arm piece 772 extending from the left and right side surfaces of the center of the plate-like portion 771 to the upper side surface, respectively, and Is formed integrally with a shape having a short right arm piece 773, and has a shaft hole drilled in each base end side of the left arm piece 772 and the right arm piece 773, and is formed at the distal end of the left arm piece 772 and is a locking link. 74 has a hooking groove 772a for locking with the lower surface side of the locking portion 741. The shaft pin 78 supports the latch plate 77 and is inserted into both shaft holes of the left arm piece 772 and the right arm piece 773.
[0020]
Here, at the corners of the upper surface and the upper surface of the inner surfaces of the case 1 and the cover 2, a base end storage wall that stores the ear portion 613a of the movable contact 61 as the center of rotation (the base end of the case 1 in FIG. 3). (Only the storage wall 1n is shown), and the lower surface of the storage wall 1n is formed in a U shape, and the leg piece 75a of the contact link 75 inserted into both the shaft holes 612a of the movable contact 61 is inserted. A guide protrusion 1o is formed in which the tip portion is inserted into the U-shaped inner wall. Thus, the movable contact 61 accommodates each ear 613a in the proximal storage wall while sandwiching the opening spring 62 on the upper side of the spring receiving portion 613, and guides the distal end of the leg piece 75a to the guide protrusion. If inserted into the wall of 1o, both shaft holes 612a can be rotated around both ears 613a while being regulated by the guide projections 1o. In addition, a cylindrical bearing having the bottom portion into which the end portion of the handle shaft 72 is inserted (only the bearing 1p of the case 1 is shown in FIG. 3) is formed at the center on the upper surface side of each inner surface of the case 1 and the cover 2. Yes. As a result, if the handle shaft 72 is inserted into the shaft hole 711a of the operation handle 71 and the case 1 and the cover 2 are fixed in a state where both ends of the handle shaft 72 are inserted into the bearings, the operation handle 71 can be It can freely rotate around 72. Further, on the lower side of the guide protrusion 1o on the inner surfaces of the case 1 and the cover 2, a cylindrical bearing having an end portion of the shaft pin 78 inserted therein (FIG. 3 shows only the bearing 1q of the case 1). (Shown) is formed. Thus, if the shaft pin 78 is inserted into both shaft holes of the latch plate 77 and the case 1 and the cover 2 are fixed in a state where both ends of the shaft pin 78 are inserted into the both bearings, the latch plate 77 is fixed to the shaft pin 78. It can turn freely.
[0021]
As shown in FIG. 1, the braided wire 8 has one end (left end in the figure) connected to the upper surface side of the bimetal 513 of the load side terminal 51, and an oblique direction from the upper surface side of the bimetal 513 to the distal end direction of the movable contact 61. In other words, it is stretched in an oblique direction near the upper side surface of the lower surface side and is routed so as to be folded back to the upper surface side of the body in the vicinity of the movable contact member 61, and the other end is connected to the proximal end side of the movable contact member 61. Yes. As a result, the load side terminal portion 5 and the movable contact 61 are always electrically connected by the braided wire 8. Moreover, since the braided wire 8 does not catch on the bimetal 513, the movable contact 61, or the like with respect to the displacement of the bimetal 513 and the rotation of the movable contact 61, the folded portion can have a margin. It is possible to prevent the 513 tripping characteristic change.
[0022]
Here, at the position where the braided wire 8 is folded back on the inner surface of the case 1, the projection 1r (first surface) that protrudes from the upper surface side of the container than the braided wire 8 and contacts the braided wire 8 at the side surface rounded in a semicircular arc shape. A vertical wall portion 1s extending in the direction of the upper surface and the lower surface is formed between the braided wire 8 extending to the upper surface side of the body and the movable contact 61, and this vertical wall is formed. The part 1s is connected to the partition part 1t that reaches the lower surface. Accordingly, it is possible to prevent the vicinity of the folded back of the braided wire 8 from moving to the upper surface side of the body during the opening / closing operation of the movable contact 61. The effect of changing the trip characteristic is no longer exerted. Moreover, since the side surface of the projection 1r that contacts the braided wire 8 is rounded, the braided wire 8 can be made difficult to cut. Further, since the braided wire 8 extending to the upper surface side of the container body can be prevented from approaching the movable contact 61 due to the displacement of the bimetal 513, the braided wire 8 does not affect the operation of the movable contact 61. .
[0023]
Further, on the inner surface of the case 1, in the vicinity of the bimetal 513 on the lower surface side of the bearing 1 q slightly closer to the upper surface from the protrusion 1 r, a protrusion that contacts the lower surface side of the braided wire 8 on the side surface rounded in a semicircular arc shape 1u (second positioning protrusion) is formed. Thereby, when the bimetal 513 is displaced, the braided wire 8 in the vicinity of the protrusion 1u moves in the direction of the upper side and the lower side, so the amount of movement of the braided wire 8 in the vicinity of the protrusion 1r to the lower surface side of the body can be reduced. The space for storing the braided wire 8 of the container can be reduced. Moreover, since the side surface of the protrusion 1u that contacts the braided wire 8 is rounded, the braided wire 8 can be made difficult to cut. Further, the braided wire 8 is sandwiched between the bearing 1q and the protrusion 1u, and the notch 771a of the latch plate 77 is positioned in the sandwiched area. Therefore, the latch plate 77 is positioned with the braided wire 8 positioned. The latch plate 77 can be easily assembled. Further, there is no possibility that the braided wire 8 contacts the latch plate 77 and hinders the rotation of the latch plate 77.
[0024]
FIG. 4 is a diagram for explaining the operation of the present embodiment. Next, the operation of the present embodiment will be described with reference to FIG. When the circuit breaker is in an OFF state as shown in FIG. 4A, the operation portion 713 of the operation handle 71 is positioned on the lower side surface (left side in the figure), and the biaxial protrusions 714a of the link support portion 714 are located. Is positioned on the upper side surface (right side in the figure) with respect to the handle shaft 72, the link support portion 714 and the handle link 73 are bent and contracted, and the locking link 74 is handled by the handle link 73 via the contact link 75. The shaft 72 is pulled counterclockwise. Further, the handle return spring 76 urges the operation handle 71 counterclockwise, and the latching groove 771b of the latch plate 77 is urged toward the lower side of the upper surface side, so that the left arm piece 772 of the latch plate 77 is urged. Is in a state of being biased counterclockwise, and the hooking groove 772a of the latch plate 77 and the lower surface side of the locking portion 741 of the locking link 74 are locked. On the other hand, the movable contact 61 is urged to the lower side by the opening spring 62, both ears 613a abut against the proximal storage wall on the lower side of the body, and the plate-like part 611 is the vertical wall 1s. The movable contact 611a is separated from the fixed contact 411a of the power supply side terminal 41. For this reason, the power supply side terminal portion 4 and the load side terminal portion 5 are in a non-conductive state, and no current flows between the power supply side terminal portion 4 and the load side terminal portion 5, so that the bimetal 513 functions. Thus, the off state is not curved, and the off state is stably maintained.
[0025]
From this state, as shown in FIG. 4B, when the operation portion 713 of the operation handle 71 is rotated clockwise with respect to the handle shaft 72 and switched to the ON side, both link holes of the handle link 73 are provided. Both guide holes 742b in the locking link 74 in which the movement direction of the leg piece 75b of the contactor link 75 inserted through 73b is prohibited from moving downward due to the locking of the locking portion 741 and the hooking groove 772a. The shaft projection 714a of the link support portion 714 is positioned on the lower surface side with respect to the handle shaft 72 while being restricted by the above, and the link support portion 714 and the handle link 73 are extended. In this state, the leg piece 75b of the contactor link 75 subjected to the restriction moves from the upper surface side to the lower surface side along both guide holes 742b, and therefore moves along the U-shaped inner wall of the guide protrusion 1o. The movable contact 61 is pushed to the upper side surface by the leg piece 75 a of the contactor link 75, and the movable contact 611 a of the movable contact 61 is closed to the fixed contact 411 a of the power supply side terminal 41. As a result, the power supply side terminal portion 4 and the load side terminal portion 5 become conductive.
[0026]
In such a conduction state, an overcurrent flows between the power supply side terminal portion 4 and the load side terminal portion 5 and the bimetal 513 is self-heated and curves to the upper side surface, or the power supply side terminal portion 4 and the load When a short-circuit current flows between the side terminal portion 5 and the bimetal 513 curves to the upper side due to electromagnetic action of the short-circuit current flowing through the bimetal 513 and the magnetic flux of the magnetic plate 52, the upper surface side of the latch plate 77 is bimetal. The left arm piece 772 of the latch plate 77 is rotated clockwise with respect to the shaft pin 78 because the adjustment screw 514 screwed into the upper surface side of 513 is pressed clockwise. As a result, the latching state between the latching portion 741 and the catching groove 772a is released, and the urging force of the opening spring 62 concentrated on the latching point is released all at once, as shown in FIG. 4 (c). In addition, the movable contact 611a of the movable contact 61 is instantaneously separated from the fixed contact 411a of the power supply side terminal 41, and the power supply from the power supply side terminal portion 4 to the load side terminal portion 5 is urgently stopped (tripped). Thereafter, since the operation handle 71 is urged counterclockwise by the handle return spring 76, the operation portion 713 is returned to the off state of FIG.
[0027]
As described above, as can be seen from FIG. 4, the braided wire 8 is almost in the state of being drawn so as not to be caught by the opening / closing mechanism 7 in the on state where the tension toward the both ends is the tightest and the off state where it is slightly loosened. In the trip state in which the tension to both ends is the most relaxed while being held, since it loosens on the lower surface side of the projection 1r which has nothing to do with the opening / closing mechanism 7, the changing part such as the looseness of the braided wire 8 is 7 can be prevented, and as a result, it is possible to suitably prevent a change in the trip characteristic of the bimetal 513.
[0028]
In the present embodiment, 4 is a power supply side terminal portion and 5 is a load side terminal portion.
[0029]
  In the present embodiment, the protrusions 1r and 1u have a structure formed in a semicircular arc shape, but the present invention is not limited thereto, and a structure formed in a columnar shape may be used. In short, the first and second positioning protrusions of the present invention have at least a side surface with which the braided wire comes into contact.ThisAny structure can be used.
[0030]
【The invention's effect】
  As is apparent from the above, according to the first aspect of the present invention, the power supply side terminal and the load side terminal disposed on both sides of the container body are fixed to one of the power supply side terminal and the load side terminal. A fixed contact and a movable contact that is detachably opposed to the fixed contact are fixed to the distal end side, and the base end side serving as the center of rotation is set to the upper side of the body, and the distal end side is set to the lower side of the body. A movable contact extending in the vertical direction of the body and this movable contact are connected to an operation handle that can be operated from the outside of the body via a link. An open / close mechanism that drives the movable contact by opening / closing operation to move the movable contact to and away from the fixed contact, and the base end connected to the other of the power supply side terminal and the load side terminal is the lower side of the body and the distal end side is A movable contact that extends in the vertical direction of the body as the upper side of the body A bimetal for opening force a movable contact from the fixed contact by the opening and closing mechanism destroy the Hitoshi衝 state of the link by an over current flows between the preliminary fixed contact front end side of the free end is displaced to the device body inside direction,The bimetal is connected to the distal end side of the bimetal and extended in an oblique direction from the distal end side of the bimetal to the distal end direction of the movable contact, and is folded back to the upper side of the body near the movable contact and connected to the proximal end of the movable contact.With braided wire,in frontOne of the power supply side terminal and the load side terminal is formed with an arc running plate extending in the direction of electromagnetic force acting on the arc by interaction with the magnetic field around the movable contact on the tip side from the fixed contact fixing position IsAnd forming a first positioning projection that protrudes from the upper side of the container body at the position where the braided wire of the container is folded back and abuts the braided wire, and is positioned closer to the bimetal than the first positioning projection. A second positioning projection is formed on the upper side of the straight line connecting the lower end of the projection in the container and the braided wire connection position in the bimetal, and the lower side of the braided line is in contact with the braided wire extending in the upper direction of the container. In the circuit breaker having a vertical wall portion interposed between the contact and the contactor, a bearing for sandwiching the braided wire together with the second positioning projection is formed in the vicinity of the second positioning projection of the container, Is pivotally supported by the bearing and is connected to the link to maintain the link equilibrium state. When an overcurrent is detected, one end is driven by the bimetal to release the link connection state. Have that latch member, the braided wire toward the other end from the intermediate portion of the latch member is characterized in that the formation of the notch that penetratesTherefore, it is possible to prevent a change in the characteristics of tripping of the bimetal and to quickly extinguish the arc.
[0031]
  Also,The braided wire does not affect the opening / closing mechanism to change the tripping characteristic of the bimetal, and the braided wire does not affect the operation of the movable contact.
[0032]
  in addition,The space for storing the braided wire of the container can be reduced.
[0034]
  Moreover,Assembling work of the latch member becomes easy. Further, there is no possibility that the braided wire comes into contact with the latch member and hinders the rotation of the latch member.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of a circuit breaker according to an embodiment of the present invention.
FIG. 2 is a perspective view of a circuit breaker and the like according to the present embodiment.
FIG. 3 is an exploded perspective view of the circuit breaker according to the present embodiment.
FIG. 4 is an operation explanatory diagram of the present embodiment.
[Explanation of symbols]
1 case
1q bearing
1r, 1u protrusion
1s vertical wall
2 Cover
3 Slider
4 Power supply terminal
41 Power supply side terminal
411a Fixed contact
5 Load side terminal
51 Load side terminal
513 Bimetal
52 Magnetic plate
6 Movable contact part
61 Movable contact
611a Movable contact
62 Opening spring
7 Opening and closing mechanism
71 Operation handle
72 Handle shaft
73 Handle link
74 Locking link
75 Contact link
76 Handle return spring
77 Latch plate
771a Notch
78 shaft pin
8 Unbalanced wire
11 Terminal fitting
12 Tightening screw
13 Metal parts

Claims

The power supply side terminal and load side terminal arranged on both sides of the body, the fixed contact fixed to one of the power supply side terminal and the load side terminal, and the movable contact that is detachably opposed to this fixed contact side A movable contact that extends in the vertical direction of the vessel with the proximal end serving as the rotation center point being fixed to the upper side of the vessel and the distal end being the lower side of the vessel, and the movable contact Connected to the operation handle that can be operated from the outside of the body via a link, and the movable contact is driven to open and close the fixed contact by opening and closing the operation handle while maintaining the balance state of the link The open / close mechanism and the base connected to the other of the power supply side terminal and the load side terminal are the lower side of the body, and the distal end is the upper side of the body. When overcurrent flows between the contacts, the free end on the tip side is inside the body. A bimetal to force opening the movable contact from the fixed contact by the opening and closing mechanism destroy the Hitoshi衝state of the link by displacement direction, the movable contact from the distal end of the bimetal is connected to the distal end side of the bimetallic stretching obliquely in the distal direction by folding the upper side of the device body in the vicinity movable contactor and a braided wire which is connected to the proximal end side of the movable contact, one of the front Symbol line terminal and the load terminal, a fixed An arc running plate that extends in the direction of electromagnetic force acting on the arc by interaction with the magnetic field around the movable contact is formed on the tip side of the contact fixing position, and the braid is placed at a position where the braided wire of the vessel is folded back Forming a first positioning protrusion that protrudes from the upper side of the container with respect to the wire and abuts the braided wire, and is located closer to the bimetal than the first positioning protrusion and below the first positioning protrusion in the container. Forming a second positioning projection that is in contact with the lower side of the braided wire on the upper side of the straight line connecting the braided wire connecting position in the bimetal and between the braided wire extending in the upper direction of the body and the movable contact In the circuit breaker having an intervening vertical wall portion, a bearing that sandwiches the braided wire together with the second positioning projection is formed in the vicinity of the second positioning projection of the body, and the intermediate portion rotates to the bearing in the opening / closing mechanism A latch member that is freely pivoted and coupled to the link to maintain the equilibrium state of the link, and at one end side is driven by a bimetal when an overcurrent is detected, and has a latch member that releases the coupled state with the link. A circuit breaker characterized by forming a notch through which a braided wire penetrates from an intermediate part to the other end side .